Photosynthesis Question 31
31. Emerson’s enhancement effect and Red drop have been instrumental in the discovery of
[2016]
(a) photophosphorylation and non-cyclic electron transport
(b) two photosystems operating simultaneously
(c) photophosphorylation and cyclic electron transport
(d) oxidative phosphorylation
Show Answer
Answer : b
Hints & Solution
(b) Emerson performed photosynthetic experiment. On Chlorella, he provide monochromatic light of more than $680 nm$ and observed decrease in rate of photosynthesis known as red drop. Later, he provides synchronised light of $680 nm$ and $700 nm$ and observed increase in rate of photosynthesis known as enhancement effect. This experiment led to discovery of two photosystems- PS-I and PS-II operating in photosynthesis.
